Kotaku
From start to finish, one proficient Portal player sped through Valve's first-person teleporter in a total of 18 minutes and 5 seconds, not including load times. There's plenty of sneaky shortcuts and wall-climbing buggery being taken advantage of, but the merits of this ADD-filled speed run stand on their own.
The second half of the speed run is included after the jump. The final confrontation at the end of the second segment speeds up the already impressive, already posted sub-minute dispatching of GlaDOS.
Clippy goodness found by the gang at NeoGAF.
